Collapsible core for making hollow concrete posts and the like.



P. B. JAGGER. COLLAPSIBLE CORE FOR MAKING HOLLOW CONCRETEv POSTS AND THELIKE.

APPLICATION FILED MAR. 4, 1911.

Patented Feb. 22, 1916.

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.P. B. JAGGER. COLLAPSIBLE CORE FOR MAKING HOLLOW CONCRETE POSTS AND THELIKE.

4 SHEETS-SHEET 2.

Patented Feb II II II "I |I I I WEI" u I IIIIIIIIIIIIIII I H I ......w.PM H w I IJI I I h L I I I I I I I I I I I I I I II I APPLICATION- FILEDMARI I 191 1.

THE COLUMBIA PLANOGRAPH cov, WASHINGTON, I). I1.

P. B. JAGGER. CQLLAPSIBLE CORE FOR MAKING HOLEOW CONCRETE POSTS AND THELIKE APPLICATION FILED MAR. 4, E911. 1,172,600.

Patented Feb. 22,1916.

4 SHEETSSHEEI .3.

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THE COLUMBIA PLArgouRAPH c0 WASHINGTON, n c.

P;B.JAGGER. COLLAPSIBLE CORE FOR MAKING HOLLOW CONCRETE POSTS AND THELIKE. APPLICATION FILED NULL 191!- 1 172,600. Patented Feb. 22, 1916.

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THB COLUMEIA PLANOGRAPR 110.. WASHINGTON. D- C- UNITED STATESrarnnronnroa,

PETER BURD JAGGER, OE LONDON, ENGLAND, ASSIGNOR T0 QUEBEC SAVINGS ANDTRUST COMPANY, OF MONTREAL, CANADA.

COLLAPSIBLE CORE FOR MAKING HOLLOW CONCRETE POSTS AND THE LIKE.

Specification ,0! Letters Patent. f

ratenteai eaaa, 1916.

' Application filed March 4, 19 1 1. Serial No. 612,394.

To all whom it may concern: p

Be it known that LPnTER Bum) JAGGER, a subject of His Majesty the Kingof England, residing at Carlton Studios, Carlton Vale, Maida Vale,London, England, have invented certain new and useful Improvements inCollapsible Cores for Making Hollow Concrete Posts and'the like, ofwhich the following is a specification. v

This invention which is intended forms in molding or casting articles ofconcrete'o'r the like, relates to collapsible cores of the kind whereinmultiple rigid sections are employed in contradistinction to corescomprising a section or sections WhlClllH the distention and contractionof the. core must be more or less distorted, or in other words leave thearticle with a wrapping up action.

The object of the present invention is to provide a core of the kindreferred to in which there is secured the combined features ofpresentation by the sections of a'configuring surface that is exteriorlyentirely complete and a contraction and expansion of'the sections thatis positive and direct.

A feature of the invention is an arrangement whereby outer sections aredistended or contracted'with a slower movement than inner sections, sucha differential movement enabling exceptionally good joints to beobtained, and rendering the invention specially applicable to cores formanufacturing such long tapering hollow articles as concrete telegraphpoles forty feet long or thereabout. Such a core I will proceedtodescribe with reference to the accompanying drawings, wherein V Theviews Figures 1 and 1* on Sheets 1 and :2 represent if placed end toendin the order given, a complete core in sectional elevation (the sectionbeing takenon the line II of Fig. 2, Sheet 3) suitable for a longtapering post such as could be utilized as a telegraph pole. Figs.2 and3, Sheet 3, are

transverse sections of the core' on. the line IIII Fig. 1? and' ll'l lllFig. 1 respectively. Fig. t, Sheet illustrates a modified core under theinvention wherein the longitudinal sections may be individually adjusted.

According to the invention, the core is composed of a number of parallelor. converging longitudinal sections a, b, 0, cl having a shape in crosssection corresponding to the lns de cross-sectional shape chosen for thearticle to be made.- For instance if the cross sectional interioroutline of the articlelis to be substantially a square,'eachlongitudinal section'will be of section as in the exampleillustrated'and the number of the individual longitudinal sections willpreferablybe four.

The sections are so disposed with relation to each otherthat conjointlythey form a hollow core, with the adj acent-edges of individual sectionsoverlapping. Thisoverlapping of the sections is so arranged that theoppositely disposed sections a, '0, and 6,

cl may be drawn closer together or moved apart, to respectively contractor expand The sections "so-disposed are rigidly supportedfrom a rod 6which runs through the core and may advantageously be disposed centrallythereto. The supporting means in the example illustrated on Sheets 1, 2and 3,take the form ofa series of sets of arms or spiders f Fig. 2, ortheir equivalent g, Fig. 3, spaced apart and fixed to the said centralrod 6, and'slidingly connected to slide-rods or-slide-bars it runninglongitudi- The slide-rods or slide-bars are set atan angle to nal of,and carried by, the sections.

thecentral rod. For instance, in the case of vthe tapering coreillustrated in Sheetsl and 2 they may run parallel or substantially sowith the longitudinal sections" Thus by a simple lengthwise-movement ofthe central rod 6 relatively to the core-sections, and in a directiontoward the wider end of the core, the sections will be drawn closertogether simultaneously over the whole of will be similarly moved apart.Such lengthwise movement of the'central' rodmay advantageously beeffected from the ends: of

the core by screw-threading aniend of the rod 6 and providing a screwnut'o to turn thereon while working against a fixedabut- To give thedifferential movement to the oppositely disposed sectionsfthe slide-rodsor slide-bars of those sections which lap intheir length while with areverse lengthwise "movement of the central rod thesect ions edges ofthe outside lap sections will ad-% vantageously be beveled asindicatedat m.

correspondingly to their line of movement.

A convenient way of'arranging this dif-.

ference in the angle of inclination of the slide-bars to the central rodis illustrated, and consists in securing the slide-bars of the sectionsZ), d at a distance from the corners of the sections 7), cl while theslide-bars of the sections, a, o are secured directly to the cornersthereof. For a distance along the narrow portion of a tapering-core,such as is illustrated, distance pieces n are, as shown, employed, butas the distance between the slide bars and the corners of the sectionsincreases, corner brackets such as 11 can be substituted.

For long lengths ofposts, such as are suitable for telegraph poles, andas in the example of core depicted the longitudinal sections willadvantageously each be composed of a number of separate lengths buttjointed and connected by butt straps j. lVhere the slide bars areconnected directly to the corners as in the case of the-sections a, 0,the slide bars are formed with notches is to fit snugly over the strapsj. The butt straps j on the sections 6, (Z which lap outside the othersections, have their limbs shorter than those of the correspondingsections as shown, in order to leave the requisite clearance for thecontraction of the sections.

The central rod e may likewise advantageously be made up of separatelengths, a convenient arrangements for connecting which, consists inhaving the sets of slidebar engaging arms or spiders f, or theirequivalent 9 carried by bosses Z internally provided with right and lefthanded screw threads, and utilizing these bosses for connecting thecentral rod lengths which are correspondingly. screw-threaded at theirends to engage the bosses,rthe two ends be ing pinned in the boss, ifdesired, to normally prevent-possible unscrewing thereof. In practice Ihave found such pinning une necessary.

The core can be assembled by threading the slide-bars of thelongitudinallsections into the arms f, or their equivalent g, care beingtaken to connect the inside lap sections first. Where the longitudinalsections are each composed of a plurality of sections, each part can bethreaded separately the corresponding sections.

Although for the reasonsthat it constitutes an important application ofthe invention, I have chosento describe theembodiment ofthe,inventionillustrated. in Sheets 1 and '2 with reference to-ataperingcore for use-in manufacturing of an artificial conglomerate, along tapering hollow post such as could be utilized for a telegraphpost, it willbe un-v derstood that the invention is not limited totapering hollow. posts, but can be utilized for makinghollow posts orthelike of 'an artificial conglomerate. having the same cross sectionalextent throughout- It will; be understood that the invention is notlimited to theemployment of a single red common to all the sections. Forinstance as.

depicted inFig. 4 Sheet 4, wherethe dir'nen sion of the article tobemade permits, any

individual adjustment of each section of the 1 core can beprovided forby arranging sepa-l common support such as a .frameand arranged to havea lengthwise movement as hereinbefore described imparted separatelythereto. With this arrangement, the inside lap sections would of'coursebe drawn in, before the outside lap sections.

By the term posts or the like I include telegraphposts, pipes, hollowfloors, hollow partitions, and other such hollow articles,

tapering, or parallel, made of an artificial conglomerate, and requiringthe employment of a collapsible core, and although the invention isparticularly applicable for use in makinglong hollow articles such astelegraph poles of forty feet, more or less, long its range ofusefulness will obviously include hollow articles of divers lengths andwidths, made in situ or inthe factory. Also i the cross sectional shapeof the core and the numbers of the longitudinal sections which it maycomprise can be variedIfr'omthat chosen for illustration without going,be yond the scope of the invention;

7 For making the articles in the factory, I obtain the-best results byconsolidating the concrete by means ofia machine made and operating,according to. my previous Patent No. 967 ,196. p

Having now I particularly described and ascertained the nature of mysaid invention:

and: in what manner, the same is to be performed, I declare that what Iclaim is":

A collapsible core comprising a number of rigid sections of which theedges of the alternate sections overlap the adjacent edges of thesections lying intermediate, a .rod disposed within the sections, aseries: of

members attached tothe rod,-slide bars slid-1' ingly engaged by saidmembers and secured to thesectionsout of parallel with the rod,

the slide bars actuating the inside sections being more sharply inclinedto the rod than In testimony whereof I affix my signature the slide barsactuating the outside sections in presence of two witnesses. and meansassociated with the rod for imparting lengthwise movement to the saidmember to thereby distend or contract the Witnesses: outer sections witha slower movement than S. P. BARNES, the inner sections. L. CowLs0N.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

I Washington, 11.0.

PETER BURD JAGGER.

